2.3道路工程选读.pptx

关河万里路悠悠——道路工程;鲁迅先生曾经说过：世上本没有路，走的人多了，便也成了路。 As blood transportation through body arteries is essential for the well-being of the human being, a similar good system of transportation has actually become a measure of country’s economic and social development. ;交通运输体系: 铁路、道路、水运、航空和管道 Road Transport Characteristics 适应性强：Road can be used by all sorts of vehicles, and are equally useful for pedestrians also. Other modes of transport can move only on specific types of paths. 机动性好：Road can lead to any remote place . Railways will lead to railway stations, airplanes to airports and ships to harbours , while roads can reach any place. 投资少：Investment on road transport by government is comparatively small. ;4;5;6;7;8;9;;2.3.1 论道路，密如蛛网;12;13;;郑州市北区道路网;莫斯科、巴黎、伦敦、柏林、东京等城市都是环形放射式道路网。;青岛市道路网;上海市干道系统图;19;20;21;22;23;24;25;26;27;28;29;30;31;32;33;34;35;36;37;38;39;40;41;42;43;44;交叉口的分叉点、交织点和冲突点 ; 立体交叉是两条道路在不同平面上的交叉，两条道路上的车流互不干扰，各自保持其原有行车速度通过交叉口。 ;47;2.3.4 筑路基，难免填挖;49;50;51;52;53;54;55;56